Stirrup chair



' May 12, 1925. 1,537,699

H. S. ROCKWELL STIRRUP CHAIR Filed Dec. 29, 1923 5 l0 IN vE l/ vToR Hm? vfi/w 5. Roe/(WELL a m m 7 Patented May 12, 1925.

UNITED STATES PATENT 0mm Heuveuus. nooKwr or i/rr iu ieroLrs, MINNESQTA.

sTIltR-UP CHAIR. I

Applieation file l' Hecember 29, 1923. Serial 110.683384.

usually required in the structural reini orceineut and ellectinp; a considerable saving in the cost of the stirrups.

A. turther objectis to provide a stirrup enair which will insure the stirrups and beam rods being placed in substantially the same position with respect to the surface ol" tlie bezun even though the stir-raps areput in position by unskilled labor.

A turther object is to provide a stirrup chair which will support the stirrups so that they will always be uniformly and properly spaced from the outer surface otthe beaui uiul thereby fully protected by a concrete covering.

The invention consists generally in va rious constructions and combinations all as horeiuatter described and particularly pointed out inthe claims.

In the accompanying drawings forming part of this specification,

l igure l a sectional view through a portion of slab and interior beam construction showing my improved stirrup chair in position therein;

Figure '9 is a similar view showing the rention applied to an exterior or lintel bezuu'; i

l i egure 3 a view corresponding to the previous figures illustrating the invention applied to an inyerted or rectangular beain;

Figure l is a perspective of the chair ready for use;

Figure 5 is a similar view illustrating the chair adapted "for the exterior and-inverted type of beain.

in the drawing; Figure 1, form for a horizontal or flat slab forming the floor of the building. 3 and l are the vertical side walls of the depending r'orin for the horizontal beam of the floor into 2 represents a which the concrete is poured in the usual way in the erection ot'the building, It has been customary to provide stirrups'depending within the beam torin and supporting horizontal reinforcing rods in the lower portion of the beann These stirrups have been supported in various ways usually by hav- 1n; downwardly turned end portions resting upon the bottom of the slab form and other means have" been provided for sup porting the stirrups, all requiring a diti'eu ent term of stirrup for use in different positions in the beam and floorstructure, pro- ,viding all these different l'OlllfiS of stirrups has'added, o't course, to the expense or the reinforcement and the tune and labor re quired in plac ng the stirrups in position.

Then, too, unless the stirrups were careful-Q ly placed by a skilled workman, some would beoutot position or too near the outer surface of the beam, or where the reinforcing rods supported thereby would not be e1- tective toithe purpose designed. These stirrups usually are put in place by unskilled or incompetent worltinen and very little attention is paid to placingthenrunitorinly in the term or where the reinforcing rods would be in position to be most eitective. liloinetinies the stirrups would be so near the surface oi? the beam that the metal. would be exposed to the elements and in such case, the rein'torcinp rods would be in the same degree out of their proper posi- 'tion.

To eli ninate this di'liiculty in the use of a reintorcing'rod supporting stirrup, I have devised a chair which not only will permit the use ot a standard form of stirrup but will insure the-proper placing otthe stirrup and the reinforcing" bars in the structure by an unskilled or incoiniietent worl-zn'lan. In other words, it the stirrup is placed in its depending;position in the beam, it must be properly placed with its depending legs unitornily spaced from the outer surface otthc beain.

In carrying out my invention, I provide a section of angle plate 5 having its lower por tion provided with ears 6 turned outwardly tofit the inner surface of the form sides 3 and at and be secured thereto bysuitable means such as nails 7. Between these ears, the angle plate is cut away as indicated at 8 to provide openingsthrough which the conbe most effective as a reinforcing means.

crete may flow freely. The upper portion of the angle plate is preferably of solid construction projecting up through the form for the floor slab and its angle is provided with a recess 9, the bottom of which is a suitable distance below the top of the floor slab and is adapted to receive the horizontal reinforcing rods 10 which extend through the floor slab above the beam on each side of the beam form. The stirrup 11 has hooked ends 12' which are hung on the rods 10; the stirrups, depending within the beam, form a supporting means for a series of beam rods 13 which extend longitudinally of the form near the bottom thereof. The angle plates or chairs 5 serve, therefore, not only as supports for the rods 10 and the stirrups 11 but as a spacing means insuring the uniform spacing of the legsof the stirrup from the surface of the beam so that when the rods 10 are put in position, and there is only one place where these rods can be put, an incompetent or careless workman may put the stirrups in place and those in charge of the work will know that each stirrup will be properly positioned with respect to the surface of the beam and the reinforcing rods will also be properly placed where they will If the chairs are fastened in the forms properly and this work will usually be done by a skilled workman, then there is no chance for an unskilled workman to improperly put the stirrups in position. Each one must be in the same relative position in the beam when the work is completed and the same is true of the reinforcing rods 10 and 13.

In Figure 2, an exterior beam form 1% is illustrated and here I'provide a shorter or smaller form of chair 15, as shown in Figure 5, having flanges 16 secured to the inner face of the form in the same manner as described with reference to Figure 1. The recess in the angle of the chair is substantially the same as shown in Figure 4, and I indicate it by the same reference numeral. a

In Figure 3, a form 17 for an inverted beam is shown extending above the floor slab and in this structure I provide a pair of chairs 15, corresponding to the one shown in Figure 5 which are arranged upon the opposite inner faces of the form; the stirrup being similar in construction but somewhatv to be seated against opposing inner faces of I a concrete beam form and secured thereto and having seats formed therein, beam rods fitting within said seats and extending lengthwise ofthe form, and stirrups having ends engaging said rods and depending within theform and spaced by said rods from the walls of the form.

3. In a reinforced concrete beam construction, stirrup chairs composed of sheet metal folded longitudinally to form flanges in angular relation to each other, said flanges having means for securing thelr edges to the inner opposing faces of a form and the junction of the flanges of said chairs being providedwith diagonal recesses formin-g seats, and beam rods adapted to extend lengthwise ofthe beam form and fitting within said seats and supported thereby a uniform distance from the walls of the form, and stirrups composed of rods having parallel depending portions provided with hooked ends to engage said rods and be supported thereby, said chairs supporting said rods and stirrups in substantially the same relative position in the beams and spacing them uniformly from the surface of said beams.

4. In a reinforced concrete beam construe tion, stirrup chairs and longitudinal reinforcing beam rods having seats in said chairs and positioned thereby in the upper portion ofthe beam form, beam stirrups having ends supported by said rods and depending within the beam form and.

spaced by said rods and chairs from the walls of the beam form, and rods supported by said stirrups adjacent the lower walls of the beam form.

5. In a reinforced concrete beam construction, stirrup chairs adapted to be secured to the inner faces of a form and having stirrup supports and stirrups carried by said supports and depending within the form.

6. In a reinforced concrete beam construction, stirrup chairs adapted to be mounted on the inner face of a form, supports extending .lengthwise of the form and carried by said chairs, and stirrups engaging said supports and depending within the form.

In witness whereof, I have hereunto set my hand this 22nd day of December, 1923.

HARVARD S. ROCKWELL. 

